World Handicap System: As of Jan 2020 the six different handicap systems in use around the world were unified into a single World Handicap System, and all handicap service providers use the same calculation method and the same course rating database.
Posting Season: While it varies by state, here in Oregon the posting season is Mar 1-Nov 30. This means
we cannot post rounds played here during Dec, Jan and Feb. However,
many states allow year-round posting. If you're playing somewhere with a
year-round active season, go ahead and post those rounds. Use this link
to check USGA's Handicap Active & Inactive Season Schedule.